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Publication numberUS1839406 A
Publication typeGrant
Publication dateJan 5, 1932
Filing dateAug 3, 1929
Priority dateAug 3, 1929
Publication numberUS 1839406 A, US 1839406A, US-A-1839406, US1839406 A, US1839406A
InventorsDennis W Mclaughlin
Original AssigneeDennis W Mclaughlin
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Keyless lock
US 1839406 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Jam, 5, E32. 1,839,406

D. W. M LAUGHUN KEYLESS LOCK Filed Aug. 3, 1.929

gwomto'a Demivflflfilagh (iii Patented Jan. 5, 1932 4 DENNIS MGLAUGELIN, OF BERKELEY, CALIFORNIA knnrss Locx Applioationflled August 3, 1929. Serial No. 883,383.

This invention relates to improvements in looks and more particularly to keyless locks for doors.

Among the objects of the invention are to provide a door lock having operating handles on both sides of the door by means of which the door latch may be independently operated to open and close the door from either or both sides.

Another object is to incorporate within the door lock, means by which the door may be locked against opening from one side. This is accomplished without the use of a key and by means incorporated within the lock with no removable parts.

Other objects and advantages will appear as the description progresses.

In this specification and the accompanying drawings the invention is-disclosed in the preferred form. But it is to be understood that it is not limited to such form because it may be embodied in other forms. It is also to be understood that in and by the claims following the description it is desired to cover the invention in whatsoever form it may be embodied.

In the accompanying one sheet of drawl i igure 1 is a horizontal section of a door frame and the adjacent jamb, having a lock installed therein in accordance with this invention, sections of the lock mechanism being broken away to disclose the interrelation of parts.

Figure 2 is a detail in side elevation of the manual locking mechanism.

Figure 3 is a front view of the lock.

Figure 4 is a detached detail of the latch control from the knob spindle.

In detail the construction illustrated in the drawings referring to Figure 1, comprises the conventional door jamb 1, having the vertlcal stop 2 attached thereto, against WlllCh the door stile 3 abuts to bring the latch of the lock in alinement with the strike plate 4 gained into the jamb 1.

The door stile 3 has a horizontal hole 5 bored thereinto at the desired height for the lock, to meet the transverse hole 6 counter- 50 sunk into the inner side of the door concentr1c with the smaller hole 7 bored through the frame of the door from the opposite side to meet the hole or recess 6.

The door with its framing and the construction and operation of the latch and strike plate are conventional and may be varied to meet architectural conditions.

The outer handle or knob 8 has a neck 9 fixed on the shaft 10 which extends entirely through the thickness of the door stile 3, through the opening 6-7. The inner handle 11 has its neck 12 swiveled on the round reduced inner end 13 of the shaft 10. The plate 15 is fixed across the inner end of the neck 12 by the screws 1616 and bears against the inner side of the escutcheon plate 17 screwed to the door stile 3 to cover the recess 6.

- There is a similar escutcheon plate 18 on the outer side of the door providing a hearing for the turning of the handle 8. There is thus provided a continuous spindle 10 extending between the knob handles 8 and 11 centered and journalled in the escutcheon plates 17 and 18 on opposite sides of the door.

The handle 8 is fixed to the spindle, and the handle 11 swiveled on the opposite end thereof. For finer adjustment I prefer to screw the neck 9 onto the spindle 10 and fix the same at the desired adjustment by means of the set screw 19 for the purpose of oscillating the shaft 10. The central portion of the shaft is squared from the shoulder 20 to the shoulder 20 at the beginning of the rounded portion 13.

The fixed crank 21 has the hub 22 with a square hole broached therethrough slidably fitting on the squared portion 23 of the shaft. The square portion acting as a spline permitting it to slide within the hub 22, but forcing the crank 21 to follow the oscillation of the spindle 10. This squared portion may be substituted by a key or any other conventional means which will cause this effect.

The main frame of the lock is composed of a. strip bent at 2424 to form a U-shaped frame with the sides 25-26, the ends of which have round holes therethrough freely fitting the hub 22 of the fixed crank 21,

permitting it to oscillate within the ends of the latch frame.

The protruding latch 27 has the inclined face 28 acting as a cam when it strikes the strike plate at 29, to depress the latch, to permit the closing of the door in the conventional manner. The latch head 27 is guided within the square hole through the latch plate 30 gained into the surface flush with the edge of the stile 3 of the door. This plate is fixed to the loop of the latch frame by means of the lugs 31-31 formed on the latch plate 30 and clinched over the edge of the latch plate for securing the plate 30 rigidly to the latch frame.

The latch head 27 has the stem 32 extending backwardly and through the cross plate 33. The spring 34 encircles the stem 32 and expands between the plate 33 and the latch 27 causing the normal protrusion of the latch 27 through the plate 30.

The outer extension of the latch is limited by the slotted link 37 having one end pivoted on the pin 38 fixed in the latch stem 32 and its opposite end pivoted on the pin 39 fixed in the end of the fixed crank 21. This limitation causes the latch to reciprocate in and out through the plate 30 when the handle 8 is turned right or left, the squared portion 23 causing the squared hub of the crank 21 to follow its oscillation within the limitation of the link. The head 27 sliding against the plate 25 aids in guiding the latch 27 Thus the turning of the outer handle 8 releases the latch 27 from engagement with the strike plate 4, permitting the opening of the door from the outside.

There is a similar link 40 also pivoted on the pin 38 and engaging a pin 41 fixed in the end of the free crank 42 oscillatible upon the round hub 22 of the fixed crank 21. This free crank 42 has a hub engaging the end 26 of the frame, and has a rear extension 43 with a transverse slot therein having a free sliding engagement with the extension 44 of the plate 16 fixed to the inner end of the neck 12 of the inner handle 11, whereby the rotation of the handle 11 oscillates the extension 44, which oscillation is communicated to the free crank 42 causing it to pull on the link 40 to retract the latch 27 whereby the latch 27 may be retracted by the oscillation of the inner handle 11. Thus, normally, the door may be unlatched either from the inside or the outside by turning the handles 8 or 11 in the conventional manner.

The latch lock consists of the sliding plunger 45, guided in the plate 30, and the side frame 26, and having arearwardly extending stem 46 bent at the end to form the pin 47 guided in the slot 47 in the lock plate 48. a

This plate has the forward lug 49, guided in a slot in the protruding end of the cross plate 33, cooperating with the pin and slot -4747 to guide the plate. The rear end of this plate is provided with the square jaw 50, adapted to engage the square portion 23 of the spindle 10.

The plunger 45 has a shoulder at 51 engaging behind the lock 27 which retracts the plunger 45 when the latch 27 retracts. The spring 52 encirclin .the stem 46 of the plunger expands between t e cross plate 33 and the inner end 51 of the plunger 45. This spring is compressed when the latch 27 is depressed by the strike plate 4. The strike plate holds the plunger back, see Figure 1.

In this position the lock plate 48 can be pushed back by the knob 53, having the stem 54' fixed in the plate and movable in the slot 55 in the escutcheon 17. When the knob 53 is pushed toward the handle 11, the jaw 50 engages the squared portion 23 of the spindle 10. This looks the spindle 10 and the door knob 8 against rotation preventing the unlatching of the door from that side. The lock plate 48 remains in operative position through the static friction of the plate and its depending mechanism.

The door can be unlatched by merely turning the door knob 11 in either direction, which swings the extension 44 out of the plate 16, and tilts the extensions 4341 of the hub 42. This draws the link 40 rearwardly and retracts the plunger 27. The crank 39 remains stationary as the pin 38 has free movement in the slot in the link 37. (See Fig. 4.) The door is then pulled away from the stop 2 and the jamb 1. Immediately the plunger 45 leaves the strike plate at 29 the expansion of the spring 46 snaps the pin 47 against the end of the slot 47 'and jerks the latch plate jaw 50 out of engagement at 23 rendering both door knobs 8 and 11 free to operate the latch 27 The outer door knob 8 cannot be locked unless the door is in the closed position, see Figure 1. The door knob 11 can never be looked under any circumstances, so that the occupant cannot lock himself in, except by the lock knob 53, which is immediately released when the door knob 11 is turned and the door opened.

Such locks are intended particularly for interior rooms, such as bathrooms, bedrooms and the like. WVhen used in a door in an exterior wall, 'a lock in accordance with this invention can be combined with a key lock and used as a night bolt so that the door cannot be opened with a key from the outside, except at the will of the occupant.

Some of the advantages of such a lock are that interior bolts and other safety means at present resorted to, Where key locks are used, are unnecessary. There is no keyhole through which one may view the intevior of the room, nor keys to be withdrawn or lost. One unfamiliar with the operation of such a lock, finding himself locked within a room would unlock the door by simply turning the handle 11, being unaware that the door was locked. In installing the look, after the door stile 3 has been properly morticed, the lock frame 25, 26 is inserted on the opening 5. The spindle is thrust through the opening 7, the cranks 21 and 42 and into the door knob 11. The split pin 57 is placed through the fixed crank 21 and the spindle 10. The

10 escutcheon plate 17 holds the knob 11 in position on the door and covers the recess 6. The latch plate 30 is gained into the edge of the door frame 3 and held by screws through the holes 58 -58.

15 Having thus described my invention, what I claim and desire to secure by Letters Patent is A door lock comprising a shaft adapted to extend transversely through a door and having a handle fixed on one end thereof; a handle swiveled on the other end of said shaft; a door latch adapted to engage a strike plate on a door jamb and be independently operated by said handles; a manually operated lock plate engaging said shaft; a plunger engaging said lock plate and held inoperative by said strike plate and ada ted to retract said lock plate when released rom said strike plate.

In testimony whereof I have hereunto set my hand this 20th day of July, A. D. 1929.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3917329 *Jul 30, 1973Nov 4, 1975Pioneer Audio CorpLock
US4826221 *Apr 3, 1987May 2, 1989Hartwell CorporationTension and shear latching mechanism
US4828299 *Mar 31, 1987May 9, 1989Hartwell CorporationLatch
U.S. Classification292/150, 292/146, 292/DIG.240, 292/177, 292/167
International ClassificationE05C1/16
Cooperative ClassificationY10S292/24, E05C1/163
European ClassificationE05C1/16C